After that, Rozen and the others boarded a luxurious limousine that Nakamura seemed to have specially arranged for them and returned to the high-class condominium on the west side of the artificial island.
Along the way, Yusha and Agulola asked Rozen how he planned to solve the problem of Astarudi's lifespan.
It wasn't a difficult question.
"If it's a more orthodox method, it would be to use magic and curses as the main methods, supplemented by cultivation tanks and adjusting equipment, to adjust the artificial life's body and slowly replenish its lost vitality. That's it."
This was a more conventional method. The advantage was that it could improve Astarudi's condition, but the disadvantage was that it was time-consuming and troublesome.
"Of course, there's also a more unorthodox method."
Rozen had said so before.
"As long as you absorb the required life force from other individuals, you can also replenish your lifespan."
As far as Rozen knew, many magicians and incantators had used this unorthodox method to obtain a long lifespan.
There were even people like Ashiya Michiman, who gave up his human identity and transformed into some unknown existence in order to obtain a near-eternal life. There were many people like this.
Therefore, there were many ways to extend an individual's lifespan, but most of them weren't good.
Rozen was prepared to use the not-so-good method.
"I can provide my own life force to Astarudi. That way, her problem can be solved."
So Rozen came up with this plan.
Of course, Yusha and Agulola strongly opposed it.
"How … How can you do that? Won't it be dangerous for Yao-kun …?! "
"I … I don't think this is appropriate! And it's not rational! "
Yusha and Agulola objected agitatedly one after another.
This made Rozen smile bitterly and hurriedly explain.
"Don't worry, I'm not so great that I'd give my life to someone I've just met. It's just that I'm different from others. I have a monster with infinite life force inside me. As long as I use its life force, it'll be foolproof."
That was right.
Just like the familiars Rozen had raised in his blood, he could use the seal in his body to pay for his life force. Using the same principle, Rozen could also create a path between him and Astarudi. Through this path, Astarudi could absorb life force from the seal in Rozen's body. Not only would she be able to replenish her lost lifespan, but she would also be able to continue using her artificial familiars.
This was not a difficult task.
In Chaldea, there were records of observing the Holy Grail War in the parallel world. Many of them used this method to connect with other individuals outside, and the mana consumed by the servants was paid for by beings other than the master.
The reason why Chaldea's Heroic Spirit Summoning System could pay for the Master's Servant's mana was based on the same theory.
Using this theory and method as reference, Rozan Can could use the same method to connect his summoned familiars and familiars with the seal in his body, allowing the seal to pay for his mana and life force.
However, he could not do this when using magic and curses. He had to pay for the mana consumed himself, and there was no way to connect with the seal in his body. Otherwise, Rozen would not need to break the seal at all. He could just use the sealed mana directly.
As for Astarudi, Rozen could use a method similar to a contract to build a connection with her and let Astarudi absorb the life force sealed in his body.
Naturally, this was equivalent to holding Astarudi's life force in his hands. As long as Rozen wanted to, he could stop Astarudi's life force at any time. Therefore, if one did not have the resolve to entrust their life to Rozen, it was better not to use this method.
"Anyway, I'll wait for Sister Nakamura to finish protecting Astarudi first. Then, I'll ask the child personally and see what she has to say. You don't have to worry."
Rozen's words finally calmed the two girls down.
Thus, the group returned home without a hitch.
However, after sending Yusha and Agulola home, Rozen came out again.
His destination was the apartment below his room.
As soon as Rozan Can arrived, the door was opened.
"Is there anything I can help you with? Senpai? "
Shue Cai, who had also just returned home, looked at Rozen with a puzzled look.
It seemed that Shue Cai, who had been monitoring Rozen's every move with her Spirit-branded Shikigami, had already noticed that Rozen was heading towards her house, which was why she opened the door immediately.
"I'm just here to take a look."
Rozen gave a perfunctory reply, ignoring Shue Cai's shock, and directly entered her house.
"Wait, senpai …!"
Shue Cai didn't seem to expect Rozen to barge into her house directly. When she reacted, Rozen was already in the living room.
"It's emptier than I thought …"
So Rozen, who was standing in the living room, looked around helplessly.
It was empty without a single piece of furniture. It didn't look like a place where people lived at all. It was more like a rental room waiting to be transferred.
"Seems like I'll have to buy furniture for you next time."
Rozen said.
"No, it's fine. Even if I'm at home, I'll focus on the Spirit-branded Shikigami. I won't watch TV or sit on the sofa. I just need an empty space for me to meditate."
Shue Cai, however, shook her head and said.
"Aren't you afraid that when your classmates or friends come to your house to play, you won't have anything to entertain them with?"
Rozen rolled his eyes and asked.
"I don't have that kind of reservation, and I won't play with my classmates or friends. Don't worry about it."
Shue Cai replied as if she was an outsider.
Only then did Rozen turned around and looked at Yukari.
"Senpai?"
Being stared at by Rozen, Shue Cai felt a little uncomfortable, and she was at a loss for words.
"What's wrong with you?" Rozen didn't beat around the bush and asked directly: "You haven't said a word since you came back from school. Do you think I didn't notice?"
Hearing that, Shue Cai was speechless.
Under such circumstances, Rozen continued.
"You became like this because of Astaruti, didn't you?"
Rozen said in an affirmative tone.
After Rozen revealed what happened to Astaruti, Shue Cai's impression of Shue Cai changed. Not only did she become quiet, but she also rushed out without hesitation when Astaruti's beast went berserk and used the Type-Seven Assault Demon Subduing Machine Gun to save Astaruti.
This showed that Shue Cai also felt what happened to Astaruti.
That's right.
She felt what happened to Astaruti.
"That's because you're also a disposable tool specially cultivated by the Lion King Agency, right?"
Rozen's blunt words made Shue Cai bite her lip.
Obviously, Rozen was right.
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